216372220 has 24 divisors (see below), whose sum is σ = 455220864. Its totient is φ = 86389056.

The previous prime is 216372187. The next prime is 216372239. The reversal of 216372220 is 22273612.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1429 + ... + 20851.

It is an arithmetic number, because the mean of its divisors is an integer number (18967536).

Almost surely, 2^216372220 is an apocalyptic number.

216372220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

216372220 is an abundant number, since it is smaller than the sum of its proper divisors (238848644).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

216372220 is a wasteful number, since it uses less digits than its factorization.

216372220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19989 (or 19987 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 25.

The square root of 216372220 is about 14709.5961875233. The cubic root of 216372220 is about 600.3444503669.

It can be divided in two parts, 21 and 6372220, that multiplied together give a triangular number (133816620 = T₁₆₃₅₉).

The spelling of 216372220 in words is "two hundred sixteen million, three hundred seventy-two thousand, two hundred twenty".